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Is declaration of variables allocated memory?
Constants, static variables and global variables are allocated in the program's data segment at compile time. Local variables are allocated on the stack at runtime. Variables cannot be allocated on the heap, you must use a constant, static variable, global variable or local variable to store the start address of a dynamic memory allocation. The variable must be a raw pointer or a reference handle (a smart pointer).
How do you initiate variable at compile and run time?
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What makes a variable a global variable?
a variable that is defined within a block is considered to have local scope, i.e., it is only visible to the block that contains it. Its lifetime is also limited unless it is marked as a 'static' variable, in which case it will exist for the entire length of program execution.
What is global variable in C programming?
A global variable is a variable that is declared at global scope, rather than file, namespace, function, class or nested scope. Global variables are usually declared with external linkage within a header and initialised in one (and only one) source file. Any file that includes the header (which includes the source file that initialised the global variable) then has unrestricted access to the variable. It is globally visible and any code can alter it. Global variables should be used sparingly and only when absolutely necessary. If the vast majority of the functions in your program require access to a particular variable, then a global variable makes perfect sense and is by far the simplest solution. However, a variable that is only used by a handful of functions can hardly be described as a global entity, thus it has no place within the global namespace and should be scoped to those functions that actually require it instead.
What is compile time?
Compile Time: In longer form, you might say, "at the time of compiling", or, "when the program is compiled". When you compile a program, the compiler applies various processes to your source code in order to generate the executable files. These are actions that happen "at compile time". Other actions happen when you actually run the finished program. These actions are said to occur, at, or in, "run time".
